A multisensor system for monitoring the quality of carbon dioxide in the beverage industry

Abstract

In this work, we report for the first time that a system based on metal oxide resistive gas sensors can successfully determine the presence of trace-level pollutants in a carbon dioxide stream. The successful use of metal oxide sensors in the absence of oxygen (oxygen concentration below 15 ppm) has enabled a new type of analyzer to assess the quality of carbon dioxide, offering continuous monitoring capabilities, ruggedness, simplicity, wireless communications and low cost.

Detection of SO2 and H2S in CO2 stream by means of WO3-based micro-hotplate sensors

“…It is in this context that Vilanova et al [9,10] developed a multisensor system (seven sensors based on tin oxide doped with different noble metal catalysts) to detect traces of methane, ethylene and sulfur dioxide (at levels established by the ISBT) in a CO 2 stream. However, the tin oxide sensors used showed low sensitivity to sulfur compounds, especially to hydrogen sulfide.…”